Tag Archives: Transformer oil properities

The cooling arrangement of the transformer varies according to the size and capacity of the transformer. When both the capacity and size increased, the arrangement becomes extra powerful and sophisticated. In other words, transformer cooling system us an arrangement intended for power transformers that limits the released heat into a safe value with proper dissipation of generated heat.

In dry type transformers, air is used as a coolant whereas in oil filled transformers, both air and transformer oil are used as the coolant medium. Different types of cooling methods used for transformers are as follows-

1.Air Natural Type

This cooling method is used in dry type transformer that is having smaller ratings. This technique uses natural air, which is circulated inside the system to eliminate generated heat. These transformers are also known as self-cooled transformers in the market. This type of cooling system offers satisfactory operation, but it is limited to low voltage transformers only.

2.Air Forced Type

This type of cooling method is used in dry type transformer and can be used in oil filled transformer as well. In this method, cool air with extreme pressure is provided to the core. The high speed fans installed in the system produce high velocity of air to the transformer.

3.Oil Natural Air Natural Cooling (ONAN)

This system is used in oil immersed type transformers. This is the easiest method to cool down the oil immersed transformers.

4.Oil Natural Air forced (ONAF)

Air is forcefully applied to the transformer, which is produced by high speed fans equipped inside the transformer.

5.Oil Forced Air Forced (OFAF)

Big oil immersed transformers release more heat and for these transformers, special cooling techniques are introduced by the experts. Oil forced air forced cooling system includes both oil and air that are circulated at high speed by some extra configuration.

All these methods are specifically used for a specialized transformer device. Exporters of power transformers India have shared this information just to make the users aware of these techniques to cool down their transformer devices.

With increasing rating requirements of latest transformers and power equipments, insulating material and fluids are experiencing the greater electrical stress. To manage such greater stress, it is important to have good electric strength for transformer oil along with lower water residue. When user takes help of transformer oil filtration method whenever required, he promotes long life and efficiency of the machine. Timely and proper treatment and maintenance of these insulating fluids enhance the properties of the entire power transformers’ insulating system.

Insulating oil or transformer oil is a refined mineral oil. This highly refined mineral oil has excellent electrical insulating property in comparison with other mineral oils. They (highly refined mineral oil) are stable at high temperature. They are used in different fields like in suppress corona, high voltage switches, fluorescent lamp ballasts, high voltage capacitors and also in the circuit breakers. Continue reading →